FIELD: foam means for fire extinguishing. SUBSTANCE: foaming agent includes, wt%: surfactant 8.109.1; aluminum oxychloride 11.0-12.3; ammonium acetate 36.6-40.6; acetic acid 1.5-3.0; the balance, water. Introduction into foaming agent composition of acetic acid makes it possible to increase shelf time of more concentrated foaming agent, to prevent its gelling, and to increase foam stability by a factor of 2 to 4. Foaming agent may be used with natural water of any hardness and salt content, and also with cryogenic salt system, with mineral salts content of up to 20 wt%. EFFECT: higher efficiency. 1 tbl, 6 ex
